<?php
namespace TYPO3\CMS\Extbase\Mvc;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

/**
 * Dispatches requests to the controller which was specified by the request and
 * returns the response the controller generated.
 */
class Dispatcher implements \TYPO3\CMS\Core\SingletonInterface {

	/**
	 * @var \TYPO3\CMS\Extbase\Object\ObjectManagerInterface A reference to the object manager
	 */
	protected $objectManager;

	/**
	 * @var \TYPO3\CMS\Extbase\Reflection\ReflectionService
	 * @inject
	 */
	protected $reflectionService;

	/**
	 * @var \TYPO3\CMS\Extbase\SignalSlot\Dispatcher
	 * @inject
	 */
	protected $signalSlotDispatcher;

	/**
	 * @var array
	 */
	protected $settings = array();

	/**
	 * Constructs the global dispatcher
	 *
	 * @param \TYPO3\CMS\Extbase\Object\ObjectManagerInterface $objectManager A reference to the object manager
	 */
	public function __construct(\TYPO3\CMS\Extbase\Object\ObjectManagerInterface $objectManager) {
		$this->objectManager = $objectManager;
	}

	/**
	 * Dispatches a request to a controller and initializes the security framework.
	 *
	 * @param \TYPO3\CMS\Extbase\Mvc\RequestInterface $request The request to dispatch
	 * @param \TYPO3\CMS\Extbase\Mvc\ResponseInterface $response The response, to be modified by the controller
	 * @throws Exception\InfiniteLoopException
	 * @return void
	 */
	public function dispatch(\TYPO3\CMS\Extbase\Mvc\RequestInterface $request, \TYPO3\CMS\Extbase\Mvc\ResponseInterface $response) {
		$dispatchLoopCount = 0;
		while (!$request->isDispatched()) {
			if ($dispatchLoopCount++ > 99) {
				throw new \TYPO3\CMS\Extbase\Mvc\Exception\InfiniteLoopException('Could not ultimately dispatch the request after ' . $dispatchLoopCount . ' iterations. Most probably, a @ignorevalidation or @dontvalidate (old propertymapper) annotation is missing on re-displaying a form with validation errors.', 1217839467);
			}
			$controller = $this->resolveController($request);
			try {
				$controller->processRequest($request, $response);
			} catch (\TYPO3\CMS\Extbase\Mvc\Exception\StopActionException $ignoredException) {
			}
		}
		$this->emitAfterRequestDispatchSignal($request, $response);
	}

	/**
	 * Emits a signal after a request was dispatched
	 *
	 * @param RequestInterface $request
	 * @param ResponseInterface $response
	 */
	protected function emitAfterRequestDispatchSignal(\TYPO3\CMS\Extbase\Mvc\RequestInterface $request, \TYPO3\CMS\Extbase\Mvc\ResponseInterface $response) {
		$this->signalSlotDispatcher->dispatch(__CLASS__, 'afterRequestDispatch', array($request, $response));
	}

	/**
	 * Finds and instanciates a controller that matches the current request.
	 * If no controller can be found, an instance of NotFoundControllerInterface is returned.
	 *
	 * @param \TYPO3\CMS\Extbase\Mvc\RequestInterface $request The request to dispatch
	 * @throws Exception\InvalidControllerException
	 * @return \TYPO3\CMS\Extbase\Mvc\Controller\ControllerInterface
	 */
	protected function resolveController(\TYPO3\CMS\Extbase\Mvc\RequestInterface $request) {
		$controllerObjectName = $request->getControllerObjectName();
		$controller = $this->objectManager->get($controllerObjectName);
		if (!$controller instanceof \TYPO3\CMS\Extbase\Mvc\Controller\ControllerInterface) {
			throw new \TYPO3\CMS\Extbase\Mvc\Exception\InvalidControllerException('Invalid controller "' . $request->getControllerObjectName() . '". The controller must implement the TYPO3\\CMS\\Extbase\\Mvc\\Controller\\ControllerInterface.', 1202921619);
		}
		return $controller;
	}

}
